LOS ANGELES -- With the all-new F-Type Coupe debuting, Jaguar is ending production of the more expensive and aging two-plus-two XK coupe and convertible.

Both XK models will be discontinued with the 2015 model year.

Jaguar has decided to focus its development budget on a family of compacts using a new flexible aluminum architecture and the F-Type sports cars.

The F-Type convertible went on sale a year ago and the F-Type Coupe is hitting U.S. showrooms this month. Both cars only have two seats and are offered with both six- and eight-cylinder engines.

“We have other things that we need to spend our time and money on. F-Type does not replace the XK,” said Tim Philippo, product manager for sports cars at Jaguar North America.

“The XK is larger, more luxurious and comfortable and is more expensive.”

Pricing for the XK coupe starts at $85,425 and the F-Type Coupe at $65,925. Both prices include destination.

The XK series has been produced since 1996. The current generation went on sale in the United States in 2006 and would require considerable investment to replace. “There is not much commonality [with other Jaguars], it is a unique platform,” said Philippo.

There are two other drawbacks. Crash regulations have changed and a new XK would have to be substantially re-engineered to meet them, he said.

The cars are also only available with a 5.0-liter, V-8 engine and that has resulted in slowing sales in European markets, Philippo said.

XK sales in the United States have climbed 5 percent to 701 cars this year through May. Last year, they declined 18 percent to 1,346 units.

The XK series has been produced by Jaguar since 1996. The current generation XK, pictured, went on sale in the United States in 2006 and would require considerable investment to replace.

The last 50 XK models produced will be offered only in the United States as high-performance special-edition R models -- 25 of each body style. The coupe will cost $108,425 and the convertible $114,425. Prices includes destination.

Jaguar executives have said the new aluminum architecture will be used for a host of new vehicle and would not rule out a two-plus-two GT like the XK.

The only confirmed model to date is the XE compact sedan that goes on sale in the United States in early 2016 and in Europe at the end of next year. It is being billed as Jaguar's rival to the BMW 3 series, Audi A4 and Mercedes C class.